It sits close to the body to keep you warm, while the fleece has anti-microbial technology; a natural way to control odour. It is lightweight and breathable and wicks sweat away. It features a long chest zip for ventilation, thumb loops and a hood and face covering. With an extra-long back skirting, this prevents packs from chaffing against the skin. With the pocket designed in such a way, it reduces items falling out when unzipped, this versatile base layer will be with every step of the way